Ejector pump



ct, M, 19490 M. a. M NEILLE ET AL EJECTOR PUMP Filed Nov. 13, 1945 2Sheets-Sheet 1 meigiors @cfi. 11, E949. B. MacNEBLLE ET AL fi hmfiEJECTOR PUMP Filed Nov. 13, 1945 2 Sheets-Sheet 2 Patentecl Oct. 11,1949 HECTOR PUMP Martin B. MacNeille and Raymond W. Frank, Dubuque,Iowa, assignors to A. Y. McDonald Manufacturing Co., Dubuque, Iowa, atcorporation of Iowa Application November 13, 1945, Serial No. 628,177

Claims. (01. 103-5) Our invention relates to a centrifugal pump of thejet variety and has for its primary purpose the provision of a typeofpump known as the shallow well jet type and in which access can be hadto the inner parts of the pump structure, particularly the jet assemblyand the impeller for the removal or replacement of these parts, would itbecome necessary or desirable after the pump is in operation.

Another and further object of our invention is the provision of ashallow well jet pump which can be easily and quickly converted into apump of the ordinary centrifugal type and if desired can be convertedinto a type of pump known as the deep-well jet type variety in which thejet assembly is usually placed in the well or at some remote positionaway from the pump structure proper.

Another and further object of our invention is the provision of a pumpstructure which is compact and which can be placed in horizontalpositions in use on farms and the like for the purpose of drawing waterfrom wells or for forcing the water into various/places, particularly infarming operations as well as in city homes and the like.

Another and further object of our invention is the provision of ashallow well pump which can be easily converted into other types ofpumps by an ordinary workman or mechanic without the necessity of havingto make major changes in the pump and if desired the operating parts canbe sold by a dealer in separate units which can be easily attached to ordetached from the pump structure for conversion purposes.

Another and further object of our invention is the provision of a jetpump having a jet assembly located therein which is firmly and easilyfixed into the structure and capable of removal therefrom by an ordinarymechanic, made in such manner that it is practically impossible toinsert the jet assembly in an improper manner, and which can be easilyremoved for the insertion of repair parts or for cleanout purposes ifdesired or necessary. 1

Another and further object of our invention is the provision of a pumphaving the jet assembly firmly mounted and supported in the pumpstructure in such manner that it will not become displaced and whichwhen placed in the structure would not be easily displaced or renderedinoperative by water pressure or the like in the pump housing.

Another and further object of our invention is the provision of a pumphaving a volute out- Figure 3 is a cross-sectional view on lines 33 ofFig. 1.

Referring now specifically to the drawings and in which like referencecharacters refer to like parts throughout, a pump casing is providedcomposed of a main rectangular section and a bulletlike section I I atone side of the said main section, the main section having a rear endwall l2 with a circular opening l3 therein and a trunnion-like extensionl4 round the opening I3, the extension having an outer bearing face l5thereon. A bottom wall It is provided having base portions I1, I1thereon on which the pump structure rests upon any suitable foundationwith side walls l8 and I9 which are curved toward each other and mergeinto a top wall 20 having an internally threaded trunnion 22 thereon towhich an outlet pipe 23 is secured. Integrally formed with the sidewalls l8 and IS, the bottom wall l6 and a vertical front wall 24 is abullet-shaped extension 25 having an opening 26 in the end thereofwithin which a bushing 21 is threaded with a threaded plug 28 therein,the bushing 21 and the plug 1, 28 forming closure members for theopening 26.

The extension 25 has an opening 29 in one side thereof within which aninlet pipe 30 extends which leads to any suitable source of water orother fluids upon which the pump is operating.

An inner wall structure 3| is provided generally boot-shaped inlongitudinal section and substantially circular in cross sectionthroughout the greater extent of its length thereby providing an intakechamber 32 inside of the main chamber 33 formed by the outer wall of thepump structure as hereinbefore described. The wall structure 3| has anoutfiared end portion 34 integrally formed with the main wall structure3| and with the rear end wall l2, the bottom I 6 and the side walls l8and I8, except adjacent the wall l8. An opening 35 is formed from theimpeller chamber 36, one side of which is formed by the outwardly flaredend portion 36 of the wall structure 3i. A plate 31 forms a closure forthe rear side of the impeller chamber 35, with a flange 38 thereonthrough which bolts 39 .extend into the trunnion like extension i l onthe back plate i2 thereby forming a complete pump housing.

The wall 3i has an opening it therein opposite the opening in the end ofthe extension 25 through which the jet assembly is inserted and removedwhen desired, the jet assembly comprising a tubular member iii having aflange t2 thereon to which are secured a plurality of spaced legs Q3, 33which connect with the flange 12 on the tubular member 3! at one oftheir ends and with a threaded ring 5% at their other ends. The ring itis in threaded engagement with the member 3i and has studs d5, 35 forengagement with a suitable wrench whereby the jet assembly can besecured in place in the wall structure 3i and removed therefrom whendesired. A jet member a? is inserted in the ring at with. a press fit inthe ring with its outer end flush with the wall structure 3! and itsinner end terminating at the entrance of the Venturi passage in themember 4! which is curved outward at the end of the passage. Extendingcircumferentially of the wall structure is a flange 6B which supportsthe inner end of the member d! with a flange %9 extending around themember ll and in abutting engagement with the side of the flange d8whereby the rear end of the tubular member 55 is supported and held inposition in the walled structure 3i.

An impeller having a hollow hub portion 5i with a renewable seal 52mounted in the structure 3! is provided having radially extendingpassages 53, 53 therein extending from the opening in the hollow hub tothe outer periphery of the impeller 50, the passages 53 being incommunication with the volute discharge passage 36 which extendscircumferentially around the periphery of the impeller 58 and whichterminates at 56 where it connects with passage 55 formed by the endwall l8 and a wall member 55 integrally formed'with the wall l8. Thewall member 56 is angularly positioned whereby the passage 55 increasesin size toward its discharge end as shown particularly in Fig. 2.

The impeller 50 is mounted upon and supported by a motor shaft 51 havinga spring pressed seal 58 therearound to prevent leakage through theopening in the plate 31 through which the motor shaft 51 extends. Amotor 59 is provided with which the motor shaft 5? is connected, themotor 59 being secured by means of brackets 5Q, 56 and a ring 6! to themember 3i which in turn is se- 1 cured to the main housing as heretoforedescribed.

The operation of the pump as shown and described will be wellunderstood, it is believed, by those skilled in the art. Normally thesepumps must be kept primed, that is filled with water or other fluid, orsubstantially so, before being operated. Drain openings can be providedthrough which water can be drained if desired to prevent freezing, andif the pump is drained the pump casing must be filled with water, priorto commencement of operation of the pump. Assuming that the casing isfilled with water as the motor commences operation, the impeller 50rotates in a counterclockwise direction thus forcing water out of thepassage 53 and building up pressure in the main chamber. As the pressurein the main chamber is built up, water is forced through the jet 4'?thereby materially increasing the suc j the end of the intake passage inthe tube 45 until maximum capacity of the pump is obtained, dependingpartially upon the speed at which the impeller is rotated. The water isdischarged into the volute passage 36 and thence to the passage 55 intothe main chamber and a portion discharged through the outlet pipe 23,and another portion 7 passing through the jet M.

In assembling the pump for the operation described above, the motor 59,the impeller 50 and plate 3'5 can be assembled as a unit, and placed inposition in the main casting and attached to the flange id in the mainhousing by the bolts 39, and detached from the main housing for thepurpose of removing any of the parts, bearings or the like for thepurpose of renewal, repair, cleaning or the like.

The jet assembly is inserted in the chamber 32 through the opening 26 inthe wall 25. The jet fill is placed in position in the ring M, the jet4? being secured in position in the ring 44 by being pressed therein andheld in position by a friction fit, and the whole jet assembly includingthe tube 6| is placed in position with the inner end of the tube llsupported by the flannge 38. The ring Ml is threaded into the wall 3iand a wrench applied to the studs &5 so as to tighten the jet assemblyin position. In order to produce the greatest emciency it is advisablethat the inner end of the jet Q7 terminate at the entrance of theVenturi passage through the tube M which it will be noted is outwardlyflared because of the contour of the flange $2. The outer surface of thejet is? is arcuate so as to provide sufficient space for the free flowof fluid around the jet and to insure the flow of fluid in an axialdirection at the entrance of the passage in the tube M. The bushing 21with the plug 28 therein is inserted thereby closing the casing and thepump is ready for operation when set up with suitable connections. Whenit is desired to renew the jet assembly the bushing 21 is removed,access is thereby had to the ring 54, a tool can be applied to the studs45, the assembly removed for the purpose of repair, cleaning or the likeas may be desired.

If it is desired to convert the pump into an ordinary centrifugal pump,the jet assembly is removed as hereinabove described, a plug is threadedinto the opening 40 in the casing 31 thereby closing this opening, thebushing 21 with the plug 28 therein in place as shown and the pumpoperates as an ordinary centrifugal pump with the same inlet and outletconnections.

If it is desired to convert the pump shown and described into a typeknown as a deep well jet pump, the jet assembly is removed, a plug isthreaded into the opening 40 closing the opening to the same asheretofore described, the plug 28 is removed from the bushing 21 and adrive pipe connected thereto which leads to a jet assembly in a casingusually positioned in the well with the inlet pipe 38 connected to thejet assembly casing whereby the pipe 30 performs the function of anoutlet pipe for the remotely positioned jet assembly casing and an inletpipe for the pump as described and claimed herein, all of which is wellknown and understood in the art.

We provide therefore a pump in which all of the interior parts areeasily accessible to a person of ordinary skill for replacement andrepair and the like. A pump is provided which can be easily and quicklychanged to perform a plurality of functions which enables themanufacturer to make fewer models and types, the dealer to carry lessstock, and which can be easily converted by an ordinary person tovarious uses and purposes.

While we have described more or less precisely the details ofconstruction, we do not wish to be understood as limiting ourselvesthereto, as we contemplate changes in form and the proportion of partsand the substitution of equivalents as circumstances may suggest orrender expedient without departing from the spirit and scope of ourinvention.

We claim:

1. A horizontal pump comprising in combination a casing having aprojecting portion with i an inlet opening in one side thereof and anopening in the end of the said projecting portion and having an outletopening, the said casing having an inner wall structure formed therewithgenerally circular in cross section and encompassing the inlet openingand outwardly flared at one of it ends whereby an impeller chamber isformed having a discharge opening into the chamber formed by thecasing'and having an opening therein in alignment with the opening inthe end of the said projecting portion, a jet assembly comprising atube, a threaded ring spaced from one end of said tube but connectedthereto, a jet removably positioned in-said ring having its dischargeend terminating adjacent the intake end of the said tube, the inner end'of the said tube being supported by the inner wall structure and thethreaded ring also being in engagement with the inner wall structure,the jet providing a communicating passage from the chamber formed by thecasing and the chamber formed by the inner wall structure, a plateremovably secured to said casing forming a closure member for one sideof the impeller chamber, a rotary impeller having a central intakeopening therein in said impeller chamber, and a removable plug in theopening in the end of the projecting portion of the casings the said jetdischarging into the said impeller through the said tube, the pumphaving a flow line from the impeller discharge to the jet nozzle andfrom the jet discharge to the impeller intake opening.

2. A horizontal pump comprising in combination a casing having aprojecting portion with an inlet opening in one side thereof and anopening in the end of the said projecting portion and having an outletopening, the said casing having an inner wall structure formed therewithgenerally circular in cross section and encompassing the inlet openingand outwardly flared at one of its ends whereby an impeller chamber isformed having a discharge into the chamber formed by the casing andhaving an opening therein in alignment with the opening in the end ofthe said projecting portion, a jet assembly comprising a tube, athreaded ring spaced from one end of said tube but connected thereto, ajet removably positioned in said ring having its discharge endterminating adjacent the intake end of the said tube, the inner end ofthe said tube being supported by an annular flange on the inner Wallstructure and the threaded ring also being in engagement with the innerwall structure, the jet providing a communicating passage from thechamber formed by the casing and the chamber formed by the inner wallstructure, a plate removably secured to said casing 6 ings the said tubeforming a discharge for the said Jet into the central opening of theimpeller,

the said pump having a now line from the impeller discharge to the jetnozzle and from the jet discharge to the impeller intake opening.

3. A horizontal pump comprising in combination a casing having aprojecting portion with an inlet opening in one side thereof and anopening in the end of the said pro ecting portion and having an outletopening, the said casing having an inner wall structure formed therewithgenerally circular in cross section and encompassing the inlet openingand outwardly flared at one of its ends whereby an impeller chamber isformed having a discharge opening into the chamber formed by the saidcasing and having an opening therein in alignment with the opening inthe end of the said projecting portion, a jet assembly comprsing a tube,a threaded ring spaced from one end of said tube but connected thereto,a jet removably positioned in said ring having its discharge endterminating adjacent the intake end of the said tube, the inner end ofthe said tube being supported by an annular flange on the inner wallstructure and the threaded ring also being in engagement with the innerwall structure, the jet providing a com municating passage from thechamber formed by the casing and the chamber formed by the inner wallstructure, a plate removably secured to said casing forming a closuremember for one side of the impeller chamber, a rotary impeller having ahollow hub portion surrounded by a removable seal, and a removable plugin the openforming a closure member for one side of the ing in the endof the projecting portion of the casings the said jet dischargingthrough the said tube into the hollow hub of the impeller, the said pumphaving a fiow line from the impeller discharge opening to the jet nozzleand from the Jet discharge to the hollow hub portion of said impeller.

4. A pump comprising in combination a main housing and a projectingportion at one side tnereoi', the main housing having a dischargeopening therein, the projecting portion having an intake opening thereinand a jet assembly opening in the end thereof, the said main housing andthe projecting portion forming a main water chamber, an internal wallsection integrally formed with said main housing and said projectingportion extending generally horizontal of the main water chamber andenclosing the intake opening in said projecting portion, having a jetassembly receiving opening therein and outwardly flared at one of itsends whereby an impeller chamber is formed, the impeller chamber havinga discharge opening into said main chamber whereby communication is hadbetween said impeller chamber and the main chamber, a rotary impellerhaving a central intake opening therein in said chamber, a jet assemblyincluding a tube the inner end of which is supported by the internalwall section and having horizontally projecting legs on the opposite endand an externally threaded ring integrally formed with the said legs inthreaded engagement with the said internal wall section and a jet havingits inner end terminating adjacent the outer end of the said tubemounted in said externally threaded ring, a plate forming a. closuremember for one side of the impeller chamber and a plug closing theopening in theend of the projecting portion, the said pump having a flowline from the impeller discharge opening to the jet nozzle and from thejet discharge to the central intake opening in the impeller.

5. A pump comprising in combination a main housing and a projectingportion at one side thereof, the main housing having a discharge openingtherein, the projecting portion having an intake opening therein and ajet assembly opening in the end thereof, the said main housing andtheprojecting portion forming a main water chamber, an internal wallsection integrally formed with said main housing and said projectingportion extending generally horizontal of the chamber formed by the mainhousing and enclosing the intake opening in said projecting portion andhaving a jet assembly receiving opening therein and outwardly flared atone of its ends whereby an impeller chamber is formed having a dischargeopening into said main chamber whereby communication is had between saidimpeller chamber and the main chamber, a rotary impeller in said chamberhaving a central intake opening therein, a jet assembly including a tubethe inner end of which is supported by the internal wall section and incommunication with intake opening in said impeller, the said tube havinghorizontally projecting legs on its opposite end and an externallythreaded ring in- REFERENCES CITED The following references are ofrecord in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,771,988 Anderson Aug. 5, 19302,077,213 Conery Apr. 13, 1937 2,137,406 Johnson Nov. 22, 1938 2,274,987Lung Mar. 3, 1942 2,282,765 Mann May 12, 1942 2,313,585 Rupp Mar. 9,1943 2,335,109 Conery Nov. 23, 1943

